El-Baz, Rady, et al. “Comparative Study of Some Mechanical Properties of Cobalt Chromium and Polyether Ether Ketone Thermoplastic Removable Partial Denture Clasps: An In-Vitro Study”. Brazilian Dental Science, vol. 23, no. 3, June 2020, p. 6 p, doi:10.14295/bds.2020.v23i3.1935.